Gantry

A frame housing the x-ray tube, collimators, and detectors in a CT machine, with a large opening into which the patient is inserted. Part of a CT scanning machine – During a CT scan, the patient will be asked to lie on a narrow table (gantry) that slides into the...

Gastrointestinal (GI)

Relating to the stomach and intestines. The gastrointestinal system consists of the gastrointestinal tract, a tube extending from the mouth to the anus; its purpose is to break down food, prepare it for absorption and eliminate waste.

Genetic Engineering

A variety of techniques that molecular biologists use to manipulate DNA molecules to study the expression of a gene. A laboratory technique sometimes used to identify a defective gene in an unborn child which may cause a particular disease.

GFR

Glomerular filtration rate. GFR is a calculation of how efficiently the kidneys are filtering wastes from the blood. A traditional GFR calculation requires an injection into the bloodstream of a substance that is later measured in a 24-hour urine collection. Recently,...

GH

Growth Hormone, secreted by the pituitary gland; the major hormone responsible for height growth Also plays a role in maintenance of bone density in adults, body composition in that it builds muscle and breaks down fat, regulates lipids, and may play a role in...

GHRH

Growth hormone releasing hormone. GHRH, or growth hormone releasing hormone is a hypothalamic peptide that regulates the synthesis and secretion of growth hormone in the anterior pituitary gland. The growth hormone (GH) stimulation test measures the level of growth...